Pico Projector Light Engine Overdrive Highlighting
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Solution Overview
Problem
Portable pico projectors face challenges with visual display errors due to sub-optimal positioning and interference from multi-function device activities, and they lack effective methods to highlight elements within images.
Innovation Solution
A multifunction portable electronic device with a controller that executes algorithms for audio and video processing, including a light engine that can be driven above its normal operating range to increase brightness and highlight specific elements within an image by overdriving the light source and adjusting frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is driven above its normal operating range to increase brightness, then the brightness of specific elements is improved, but the light source may be damaged or its lifespan reduced
Solution Approach 1:
The patent implements periodic overdrive cycles where the light source is alternately driven at elevated current levels and normal operating levels. The controller switches between overdrive mode and normal mode in timed intervals, allowing the light source to receive rest periods that prevent permanent damage while still achieving enhanced brightness during overdrive periods. This periodic action resolves the contradiction by making the high-brightness operation temporary and intermittent rather than continuous.
Solution Approach 2:
The system dynamically adjusts the light source current based on real-time conditions and requirements. The controller monitors the light source operating parameters and dynamically switches between different current levels (overdrive current vs. normal operating current) to optimize both brightness and reliability. This dynamic control allows the system to adaptively balance the competing demands of high illumination intensity and light source longevity.
2Illumination intensity
If the light source current is increased to highlight specific information, then the brightness of highlighted elements is improved, but visual display errors such as noise and distortion increase
Solution Approach 1:
The patent applies different light source current levels to different spatial regions of the displayed image. Specifically, the controller drives the light source at elevated current levels only during the time periods corresponding to the scanning of specific regions of interest on the display screen, while maintaining normal current levels for other regions. This local quality approach allows brightness enhancement precisely where needed without introducing noise and distortion across the entire display, thus resolving the contradiction between highlight brightness and visual display quality.
3Illumination intensity
If the light source is overdriven to enhance image quality, then the brightness and clarity of displayed information is improved, but the device generates more heat and consumes more energy
Solution Approach 1:
The system employs periodic overdrive cycles where the light source operates at high current levels only during specific time intervals corresponding to the display of highlighted information, followed by rest periods at normal operating levels. This temporal segmentation of high-energy operation allows the system to achieve enhanced image brightness when needed while significantly reducing average energy consumption compared to continuous overdrive operation. The controller manages the timing and duration of overdrive periods to balance image quality enhancement with energy conservation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves image quality by reducing visual errors and effectively highlighting important elements within the projected image, enhancing the user's ability to explain and discuss displayed content.
Implementation Method 1
a light engine that can be driven above its normal operating range to increase brightness and highlight specific elements within an image by overdriving the light source
Data Source
Figure 1
Figure 2A~2D
Figure 3
AI summary
An apparatus and method for projecting an image on a surface is provided. More specifically, the method for highlighting information within an image displayed by a projection unit (30) includes receiving (400) a video signal; decoding (402) the video signal; controlling (404) a panel driver (38) to drive a light engine (39) within a predefined power range to display the video signal; and causing (410) the panel driver (38) to enter an overdrive mode driving the light engine (39) at a power level above the preset power range for a period of a scan of the video signal at which information to be highlighted is displayed.